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diff --git a/2522/CH9/EX9.2/exm9_2.sce b/2522/CH9/EX9.2/exm9_2.sce
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+// page no 285
+// example no 9.2
+// EXCHANGE OF DATA USING STACK.
+clc;
+printf('LXI SP,2400H \n \n'); // the stack pointer is located at 2400H.
+printf('LXI H,2150H \n ');
+printf('H--> 21     L-->50 \n \n');
+printf('LXI B,2280H \n ');
+printf('B--> 22     C-->80 \n \n');
+printf('PUSH H \n'); // sends the data of HL register pair in the stack.
+// stack pointer is decremented by one to 23FFH and the contents of the H register are copied to memory location 23FFH
+printf('23FFH--> 21 \n'); 
+// stack pointer is again decremented by one to 23FEH and the contents of the L register are copied to memory location 23FEH
+printf('23FEH--> 50 \n \n');
+printf('PUSH B \n'); // sends the data of BC register pair in the stack.
+// stack pointer is decremented by one to 23FDH and the contents of the H register are copied to memory location 23FDH
+printf('23FDH--> 22 \n'); 
+// stack pointer is again decremented by one to 23FCH and the contents of the L register are copied to memory location 23FCH
+printf('23FCH--> 80 \n \n');
+printf('PUSH PSW \n'); // sends the data of accumulator & flag register in the stack.
+// stack pointer is decremented by one to 23FBH and the contents of the H register are copied to memory location 23FBH
+printf('23FBH--> contents of accumulator \n'); 
+// stack pointer is again decremented by one to 23FAH and the contents of the L register are copied to memory location 23FAH
+printf('23FAH--> contents of flag register \n \n');
+
+printf('To exchange the data. \n \n')
+printf(' POP PSW \n'); // sends the data in the stack back to the accumulator & flag register.
+// the contents of the top of the stack are copied to A register and the stack pointer is incremented by one to 23FBH
+printf('A--> contents of accumulator \n');
+// the contents of the current location of stack are copied to flag register and the stack pointer is again incremented by one to 23FCH.
+printf('F--> contents of flag register \n \n');
+printf(' POP H \n'); // sends the data in the stack back to the HL register pair.
+// the contents of the current location of the stack are copied to L register and the stack pointer is incremented by one to 23FDH
+printf('L--> 80H \n');
+// the contents of the current location of stack are copied to H register and the stack pointer is again incremented by one to 23FEH.
+printf('H--> 22H \n \n');
+printf(' POP B \n'); // sends the data in the stack back to the BC register pair.
+// the contents of the current location of the stack are copied to C register and the stack pointer is incremented by one to 23FFH
+printf('C--> 50H \n');
+// the contents of the current location of stack are copied to B register and the stack pointer is again incremented by one to 2400H.
+printf('B--> 21H \n');
diff --git a/2522/CH9/EX9.2/exm9_2_output.jpg b/2522/CH9/EX9.2/exm9_2_output.jpg
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